Paper or fiber can



Dec. 2o, 1932. D, E, ca -mmk y 1,891,535

v PAI-ER 0R FIBER CAN Filed Feb. 3, 1930.

Patented Dec.v 20, 1932 UNITEDv STATES nIoxINsoN E. Gamm or `LowvILLi-x,

man 'GAN CORPORATION, OI-

Yom:`

-Nnw YORK, AssIGNOR To smTII-LEwIs LowvILLE. NEW YORK, A CORPORATION OFNEW PAPER OR FIBER CAN Application led February` 3, 1930. Serial No.425,561.

This invention relates to certain new and useful improvements in paperor 'ber cans, and pertains more particularly to the form andconstruction of an end wall thereof.

Heretofore, it has been customary to form the end wall of a ber can ofasingle disk of paper having its edge interlocked or Y seamed with theside wall of the can, and in some cases, an additional disk has beeninserted in the can structure above or below the disk with the seamededge, but so far as I am aware, no one has ever produced a paper can inwhich the end wall is formed of'two or more disks, the edges of at leasttwo of the disks being simultaneously flanged and then seamed, molded orinterlocked with the end of the side wall.

Many advanta es arise from ,this latter construction: in anging twodisks together, each forms the flange byitself and there is less strainon the folded edges of each disk than there would be in the case of asingle ply disk having the same thickness as the aggregate thickness ofthe two disks, thus lessenmg the4 tendency to break the bers of the diskat the bend where moisture might penetrate more readily into the bodiesof the disks.

Further, two disks, each of a given thickness, are more impervious tomoisture than a single disk of the aggregate thickness of the two. Thespace Abetween the two breaks the capillary attraction, therebydeterring penetrating of moisture, and with this arrangement both sidesof both disks may be treated with parane or other substances toadvantage.

Further, by using two disks, the edges of which are simultaneouslyanged, it is possible to use a treated or coated board for the outsidedisk, or to apply an oil-resisting material between the disks withoutthe treated Or coated board or inserted material coming v in contactwith the contents of the can.

Further, 'by crimping or molding two disks simultaneously, atmosphericconditions will not materially affect the tightness of the closure, asis the case with a second disk inserted but not crimped or molded, and

50 which may, therefore, shrink and become loose, and in this connectiontwo disks simultaneously flanged tend to the formation of a tighterclosure, due to their greater flexibility.l

Further, the use of two disks simultaneously crimped or molded producesa dead air space between them, thus materially increasing the insulatingproperties.

There is also an economical advantage. 'If the end wall, is a single ply.it should be l6o formed of a disk equal in thickness to two thicknessesof the stock required for the'side wall of the can so that the samestock used for the side wall cannot be used for the end wall, making itnecessary to carry two thick- 155 nesses of board, whereas, if the endis made of two disks of the same aggregate thickness as the side wall,the same stock can be used for the end wall disks as is used for theside wall plys. -`'m Other objects and advantages will appearV from thefollowing description taken in connection with the accompanying drawing,in p which Figure 1 is a perspective view of a portion y"15 of a papercan in process of manufacture.

Figure 2 is a perspective view of the completed can section.

Figurel 3 is a section on line 3 3, Figure 1.

Figure 4 is a section on line 4 4, Figure 2.130

Figure 5 is a plan view of one of the two similar end wall disks.

The cylindrical side wall l of the can 2 may be formed in any usualmanner as-by spiral or convolute winding of suitable paper stocks;purely for the purpose of illustration, the invention is hereinillustrated as applied to a can having a side wall formed by spirallywinding two overlying plys of paper stock, but the invention is notlimited to any construction or method of forming such side wall. The twodisks 3 and 4 of similar size and shape and of a thickness equal to thethickness of the stock from which the side wall plys are formed aresimu1- 95 taneously anged to form the annular overlying anges 5 and 6adapted to fit tightly within the cylindrical side wall 1 of the can.

In initial assemblage the edges of the lafs anges and 6 terminate shortof the end of the `can and the double ply side wall has its lower edgespun over to form a bead 7 which may perhaps preferably terminateadjacent 5 the lower edges of the flanges 5 and 6. i

Figures l and 3' illustrate the can rat this stage of manufacture. I

rl`he lower end of the side wall, including the bead 7 is thensimultaneously with the l@ flanges 5 and 6, folded inwardly and upwardlyand molded from the interlocked seam illustrated at 8, with bead 7,folded within the edges of flanges 5 and 6.

Figures 2 and 4 show the bead 7 folded 35 around and locking the loweredge portions of flanges 5 and 6 in position.

Preferably duringthe moldingr operation, the central portion 9 of thedouble ply end wall is pressed downwardly or the rim portion 10 of theend wall is pressed slightly upwardly so as to form an annularperipheral recess in the end wall for receiving the upper edge of theinterlocking seam portions 8 to assist in locking the seam together.

ably molded to form a shoulder `11 against which the edge of the endwall seatsto prevent upward movement of'the end wall.l

This construction `of end wall has .been shown as applied to the bottomof a comparatively small can, but is obviously applicable to theformation'of the end wall of a cover for the can which has acylindrical'side wall in effect similar to the side wall l.

The essential feature of this invention resides in an end wall of apaper can formed with two separate disks having their edgessimultaneously flangedl to form annular anges which are tightly fittedwithin the cylindrical side wall with the lower edge of the side wallinterlocked to the annular flanges of the end wall by simultaneouslymolding or spinning both the side wall and the annular flanges of thedual end wall to form a locked seam substantially Vas illustrated. Asabove suggested the outer disk' 21 may be formed of a treated or coatedboard to exclude moisture or the contacting surfaces, the disks 3 and 4may be so treated or .50 a moisture-resisting material may be insertedthe exact details of'construction and arrangement of locking seam, asvarious changes and modifications may be made within the scope of theappended claims.

I claim: j o5 1. The method of forming a paper can Further, the sidewall of the can is prefercomprising forming a tubular sidewall'consistin of two thicknesses of paper, forming an en wall by theprovision of two disks having their edges flanged and in contact witheach other, the outer flange being of an external diameter approximatelythe same as the internal diameter of the side wall of the can insertingthe-end wall within the side wall, forming the lower edge of the side.wall with an internally extending bead lying upon itself adjacent theedge of said flanges on the end wall and then molding the beaded portionof the side wall about and with the lower edges of the flanges on theend wall to form a composite bead consisting of the bead on the sidewall, a portion of the side wall adjacent said bead and a portion of theflanges on the end wall. j

2. The method of formingV a paper can comprising forming a tubular sidewall consisting of multiple thicknesses of paper,y forming an end wallby the provision of two disks having their edges flanged and incontactwith each other, the outer flange being of an external diameterapproximately the same as the internal diameter of the side wall of thecan, inserting the end wall within the side wall, forming the lower edgeof the side wall with an internall extending bead lying upon itselfadjacent t e edge of said flanges on the end wall, and then rolling thebead on the side wall about and with the flanges on the end wall untilthe outer surface of the side wall is in substantial contact with theouter surface of the end wall to form a composite bead consisting of thebead upon the side wall, a portion of the side wall adjacent the beadand portions of the flanges o n the end Wall.

'3. A paper can comprising a tubular side wall consisting of twothicknesses of paper, an end wall formed of two disks having 'theiredges flanged axiallffin overlying relation -with the outer disk ttingtightly within the side wall of the can andthe lower edge of the sidewall of the can provided with a bead lying upon itself adjacentthefreeedges of t e flanges and connin the edges of the flanges 'between thebea and the adjacent portion of the side wall with the bead insubstantial contact with the outer surface of the end wall.

4. A paper can 4comprising a tubular side wall consisting of twothicknesses of paper,

lwith overllying annular peripheral flanges fitted tight y within theside wall and the lower edge of the side wall formed with a bead 1ingupon itself adjacent the edges of the anges and within the endportions of the flanges and having a ortion of the periphery of the beadin su stantial contact with the outer surface of the end wall.

5. A paper can comprising a tubular side an ,end wall formed of twodisks provided an end wall formed of two disks provided with overlyingannular peripheral flanges fitted tightly within the side Wall and thelower edge of the side Wall formed with a bead lying upon itselfadjacent the edges of the flanges and within the end portions of theflanges and having a portion of the periphery of the bead in substantialcontact with the outer surface of the end wall, and said end Wall formedwith an annular recess for receiving said bead.

In witness whereof I have hereunto set my hand this 21st day of January,1930.

DICKIN SON E. GRIFFITH.

